package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetMealMapper setMealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //通过令牌拦截获取当前id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //判断加入商品是否已经存在
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //已存在 数量+1
        if(list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);//更新数据
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //不存在 加入购物车
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();

            if(dishId != null ) {
                //添加的是套餐
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //添加的是套餐
                Setmeal setMeal = setMealMapper.getSetMealById(setmealId);
                shoppingCart.setName(setMeal.getName());
                shoppingCart.setImage(setMeal.getImage());
                shoppingCart.setAmount(setMeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        Long userID = BaseContext.getCurrentId();
        ShoppingCart cart = ShoppingCart.builder()
                .userId(userID)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(cart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void deleteShoppingCart() {
        Long userID = BaseContext.getCurrentId();
        shoppingCartMapper.cleanCart(userID);
    }
}
